Electric indicator for doors.



No. 647,07l. Phtehted A r; :0, 19%.

n. H. BOARBMAN.

ELECTRlC INDICATOR FOR D0083.

(Application filed Oct. 12, 1698.

(No Model f 3140mm Wtbmmoco P My duction of an improved'electric indicator for Nrrnn STATES PATENT OFFicE,

RALPH II. BOARDMAN, OF NEW BRITAIN, CONNECTICUT.

ELECTRIC INDICATOR FOR DOORS.

SPECIFICATION forming part of Letters Patent No. 647,071, dated April 10, 1900. Application filed October 12, 1898. Serial No. 693,302- (No model.)

To all whom it may concern.-

Be it known that I, RALPH H. BOARDMAN, a citizen of the UnitedStates of America, residing at New Britain, in the county of Hartford and State of Connecticut, have invented a certain new and useful Improvementin Electric Indicators for Doors and the Like, of which the following is a description, reference being had to the accompanying draw ings, wherein- Figure l is a face view of a construction embodying said improvement. Fig. 2 is a face View of the two electromagnets made use of, the pivoted pointer, and parts immediately adjacent thereto, with the cover or front plate removed. Fig. 3 is a lower end view of the parts shown in Fig. 2. Fig. 4 is a side View of the box or case which incloses or covers the electromagnets and of the button or circuit-closer.

The object of the improvement is the prodoors or the like, adapted -to indicate when operated such facts as that the occupant of the room is in or out and the like.

In the accompanying drawings the letters a and b respectively denote two electromagnets adapted to be energized at proper times, as hereinafter indicated.

The letter 0 denotes a pivoted pointer. Its shaft carries the lever d, which in turn carries the two armatures a and b.

The letter e denotes a spring whose tendency is to hold the pivoted pointer to a position midway between the two electromagnets.

The letter f denotes a plate which bears suitable Wordssuch, for instance, as the word In and the word Out. It will be readily understood that when the pointer points to In it is intended to indicateto the observer that the occupant of the room is within, and when the pivoted pointer points to the word Out it is intended to indicate to the observer that the occupant of the room is not within. This plate is transparent or translucent, behind which is a small incandescent lamp g, branched from the main circuit by wires 0 and p, intended to be energized whenever either of the electromagnets is energized, that its light at such times may shine through the plate.

The letter h denotes a wire adapted to couvey electric energy from a suit-able source of such energy to the switch t, beyond which the main-line wire is lettered s. Said switch is intended to be upon the inside of the door and to beadjusted to the in circuit or out circuit by the occupant of the room in accordance with the facts.

The letter 71; denotes the return-wire of the circuit.

The letter Z denotes a Wire adapted to convey the elec-tric energy from one contact of the switch to the in elec-tromagnet, and the letter on denotes a wire adapted to convey the electric energy from the other contact of i the switch to the out electromagnet. The circuit is intended to be closed by him who approaches the door by pressing upon the button or circuit-closer 02, let into the return-wire 7c, and it will be readily understood from what follows that when the circuit is closed by pressing upon this button the pointer will be vibrated to indicate in or out, as the occupant of the room may have adjusted the switch.

Should the switch-arm be thrown to contact with the wire m, the current will flow from the battery to the switch through the wire 1% and magnet Ct, (thus causing the indicator to point to Out,) from the magnet through the wire it to the button n, and, this being closed, back to the battery by the wire it. Only part of the current takes this course. The remaining part goes from the switch through the wire 3 direct to the buzzer r and back along the wire 71) through the button to the battery. As long as the button rrt is closed the buzzer or signal will ring and the light 9 will burn, since both are in the cir cuit above the push-button.

I claim as my improven1ent 1. In an annunciator, the combination with twoelectromagnets, a pointer moved by the armatures, a casing surrounding said magnets and having a translucent or transparent plate over which the pointer moves, and an electric lamp behind said plate in a circuit branched from the main circuit; of the main circuit, a button therein for making and breaking the circuit, a switchboard, two branch circuits running therefrom through the magnets and thence to the button, and a main circuit between the button and signal, switch-arm for throwing either of the branch a second branch circuit leading from the main circuits into connection with the main circuit. circuit between the button and signahthrough 2. In an annunciator, the combination with said electromagnet, and back, and means for 15 5 a translucent or transparent plate having throwing itinto or out of connection with the Words thereon, an electric light behind the main circuit, substantially as described.

plate a pointer movin over the plate and dig recting attention to said words, and an elec- RALPH BOARDMAN' troinagnet for swinging the pointer; of a main Witnesses: 1o circuit containing a button and a signal, a ARTHUR B. OAsE,

branch circuit leading from the light to the HENRY D. VARNER. 

